I think they are because they help improve our grammar and amplify our vocabulary and at least, for me, that is way useful. When learning english is important not only to understand it, we also have to speak and write english and not only the basic.
In the future I'd like to live for a while in the United States and for me it's important to get as much english knowledge as possible because imagine I'm talking with somebody and they he uses an idiom I don't know so I can't understand what he is trying to say.
I consider that my english level is good and it never stops to amaze me how I've improved my english and I think that you can never learn enough so I'll take whatever comes.
